iQIYI IPv6 Large‑Scale Deployment: Technical Challenges, Solutions, and Management Practices

On November 26, 2017, the Central Committee of the Communist Party of China and the State Council issued the "Action Plan for Large‑Scale Deployment of Internet Protocol Version 6 (IPv6)". The plan aims to build the world’s largest commercial IPv6 network within 5‑10 years, establishing a next‑generation Internet technology ecosystem.

IPv6 (Internet Protocol Version 6) expands the address space from 32 bits in IPv4 to 128 bits, theoretically providing a unique address for every grain of sand on Earth. It was designed by the IETF to replace IPv4 and to solve the IPv4 address exhaustion problem. Despite its technical advantages, IPv4 remains dominant due to widespread NAT deployment, and IPv6 adoption has been slow.

With the explosion of IoT and cloud computing, the transition to IPv6 has become essential. For internet companies, migrating from IPv4 to IPv6 is a complex operation that touches every layer of infrastructure and application.

iQIYI established an IPv6 deployment workgroup to meet national targets. The company achieved more than 200 million monthly active IPv6 users and a traffic peak of 800 GB, positioning it among the industry leaders.

The deployment faced several challenges:

Coordinating dozens of technical departments (testing, front‑end, back‑end, infrastructure) to redesign network architecture.

Ensuring seamless user experience while switching between IPv4 and IPv6.

Developing client‑side control mechanisms to decide when to use IPv6 and how to handle IPv6 failures.

Technical solutions included the "iQIYI IPv6 Cloud Control" scheme, which integrates the QTP network library and the baseline network library to:

Control domain resolution based on app version and network library.

Implement IPv6/IPv4 connection racing and compatibility handling.

Provide IPv6 exception retry and fast fallback to IPv4 when needed.

Management practices were driven by three value‑based motivations:

Long‑term value communication : Emphasizing the strategic importance of IPv6 for the company, industry, and national information infrastructure.

Task‑oriented driving : Clear assignment of responsibilities and milestones across departments.

Personal curiosity driving : Encouraging engineers to explore IPv6 innovations and contribute to technical breakthroughs.

Looking forward, iQIYI plans to deepen IPv6 network and business value, using IPv6 to improve service experience, reduce costs, and enable new features such as client‑side IPv6 identification and dedicated IPv6 testing environments.